Since you have a polite tone in your sentences, I'd put a は between なまえ and マイケル (which is the katakana for "Michael"). "Interest" in Japanese should be きょうみ, not きょみ. As for your third sentence, さいご has a meaning closer to "last". ほしいいきます should be changed to いきたいです。 ほしい is an adjective and is used to describe nouns, as in カメラがほしい (I want a camera). For verbs you drop the ます and add たい。 I'm not sure if it's correct enough to say your Japanese is わるい but I changed it to へた anyway. Someone else want to clear that up? Two other notes: it's not necessary to put spaces in between all words and particles. It's probably preferred it you didn't do that. Additionally, I think you're not supposed to put でも right after です、(with the comma). I could be wrong, though.

I'm not exactly sure how to say "to improve", so I took the first suggestion on jisho.org x_x I hope that's okay.

I'd put what you want to say as this:

わたし・ぼく (depends on how you want to refer to yourself) のなまえはマイケルです。にほんにとてもきょうみがあります。いつかにほんにいきたいです。にほんごがとてもへたですが、てがあがるようになりたいです。私･僕の名前はマイケルです。日本にとても興味があります。いつか日本に行きたいです。日本語がとても下手ですが、手が上がるようになりたいです。